This compound, (S)-N-[2-(trimethylsilyl)ethoxycarbonyl]-N-methylleucine, is a protected derivative of N-methyl-L-leucine used as a building block in peptide synthesis. The Teoc (2-(trimethylsilyl)ethoxycarbonyl) group protects the nitrogen, providing stability during synthesis and enabling selective deprotection under mild fluoride conditions. Its chiral S configuration allows incorporation of the enantiomerically pure L-amino acid residue, essential for maintaining biological activity in therapeutic peptides. This makes it valuable in solid-phase peptide synthesis for constructing complex, stereochemically defined peptide chains in pharmaceutical and medicinal chemistry research. It is compatible with common coupling reagents and solvents.